fixes due to bad rebase

lib/core/engine.js

@@ -91,7 +91,7 @@ class Engine {
   }
 
   processManagerService(_options) {
-    const ProcessManager = require('./processes/process_manager.js');
+    const ProcessManager = require('./processes/processManager.js');
     this.processManager = new ProcessManager({
       events: this.events,
       logger: this.logger,
@@ -99,6 +99,10 @@ class Engine {
     });
   }
 
+  graphService(_options) {
+    this.registerModule('graph');
+  }
+
   pipelineService(_options) {
     const self = this;
     this.registerModule('pipeline', {

lib/core/processes/processLauncher.js

@@ -42,6 +42,9 @@ class ProcessLauncher {
   _subscribeToMessages() {
     const self = this;
     this.process.on('message', (msg) => {
+      if (msg.error) {
+        self.logger.error(msg.error);
+      }
       if (msg.result === constants.process.log) {
         return self._handleLog(msg);
       }